Lopez de Bertodano Formation
Lopez de Bertodano Formation Stratigraphic range: Maastrichtian 70 to 66 Ma | |
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Type | Geological formation |
Unit of | Marambio Group |
Overlies | Snow Hill Island Formation |
Lithology | |
Primary | siltstone, mudstone |
Other | concretion, sandstone |
Location | |
Region | James Ross Island group, Antarctica |
The Lopez de Bertodano Formation is a geological formation in the James Ross archipelago of the Antarctic Peninsula. The strata date to the end of the Late Cretaceous (upper-lower Maastrichtian stage[1]), about 70-66 million years ago. Dinosaur remains are among the fossils that have been recovered from the formation[2] and include at least two and probably as much as six lineages of indisputably modern birds: one related to waterfowl, a primitive shorebird or related form, 1-2 species of possible loons, a large and possibly flightless bird belonging to a lineage extinct today as well as a partial skull that might belong to either of the smaller species or represent yet another one.
Dinosaurs of the Lopez de Bertodano Formation | |||||
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Genus | Species | Unit | Material | Notes | Images |
P. gregorii[2] |
Lower Sandwich Bluff Member |
Partial skull and skeleton, holotype |
A loon? |
||
P.? sp. |
Lower Sandwich Bluff Member |
Partial skeleton including wing and hindlimbs |
Possibly a more primitive form with strong flight ability and lighter bones | ||
V. iaai[3] |
Lower Sandwich Bluff Member |
Partial skeleton, holotype |
An anseriform | ||
Undescribed Cariamae[4] |
Unnamed species |
Cape Lamb Member |
Isolated femur |
Close relative of cariamids and phorusrhacids | |
Undescribed charadriiform[5] |
Unnamed species |
Cape Lamb Member |
Partial skeleton |
||
Unidentified Neornithes[6] |
Unnamed species |
Partial skull |
Relationships undetermined, cranium some 5–6 cm long. | ||
Undescribed basal euornithopod[2] |
Unnamed species[2] |
||||
Undescribed hadrosaurid[1] |
Unnamed species |
Isolated tooth[1] |
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Undescribed non-avian theropod[1] |
Unnamed species |
Fragments[1] |
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See also
- List of dinosaur-bearing rock formations
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Olivero, E.B., Ponce, J.J., Marsicano, C.A. and Martinioni, D.R. (2007). "Depositional settings of the basal Lopez de Bertodano Formation, Maastrichtian, Antarctica." Revista de la Asociación Geológica Argentina, 62(4): 521-529.
- ↑ 2.0 2.1 2.2 2.3 2.4 Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Cretaceous, Antarctica)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. p. 606. ISBN 0-520-24209-2.
- ↑ Clarke, J.A., Tambussi, C.P., Noriega, J.I., Erickson, G.M. and Ketcham, R.A. (2005). "Definitive fossil evidence for the extant avian radiation in the Cretaceous." Nature, 433: 305-308. DOI:10.1038/nature03150 PDF fulltext Supporting information
- ↑ Case, J., Reguero, M., Martin, J. and Cordes-Person, A. (2006). "A cursorial bird from the Maastrictian of Antarctica." Journal of Vertebrate Paleontology, 26(3): 48A.
- ↑ Cordes, (2002). "A new charadriiform avian specimen from the Early Maastrichtian of Cape Lamb, Vega Island, Antarctic Peninsula". Journal of Vertebrate Paleontology, 22(3): 46A.
- ↑ NUEVOS RESTOS DE DINOSAURIA DEL CRETÁCICO DE LAS ISLAS JAMES ROSS Y MARAMBIO, PENÍNSULA ANTÁRTICA